title: [Factor analysis of muscular paralysis due to nerve root injury after posterior lumbar interbody fusion (PLIF)].
abstract: OBJECTIVE
  To analyze the reasons of muscular paralysis due to nerve root injury after PLIF.
  
  
  METHODS
  From January 2001 to January 2012, 1 250 cases underwent PLIF in our hospital, after operation, 29 cases occurred muscular paralysis due to nerve root injury. There were 10 males and 19 females with an average age of 61 years, 12 cases with one-segment, 14 cases with two-segment, 3 cases with three-segment. The clinical data of 29 patients were retrospectively analyzed including PODx (preoperative diagnosis), surgery procedure, postoperative symptoms and so on.
  
  
  RESULTS
  The follow-up time was more than 1 year and the longest was 2.5 years with an average of 1 year and 7 months. Twenty-three patients obtained satisfactory results and muscle strength recovered to 4-5 levels,3 patients was poor and final muscle strength recovered to 0-2 levels. Recovering time after operation was directly proportional to the degree of injury,those muscle strength level was more than 2, usually could have significant improvement within 2 weeks.
  
  
  CONCLUSIONS
  More complicated factors result in the reasons of nerve root injury after PLIF. Except those suffered severe grinding contusion and amputation, most of the patients can get satisfactory effect.
authors.affiliation: The First Department of Spinal Surgery, Wangjing Hospital of China Academy of Chinese Medical Sciences Beijing 100102, China. liuyuzhang.73@yahoo.com
authors.forename: Yu-Zhang
authors.initials: YZ
authors.lastname: Liu
authors.forename: Shi-Min
authors.initials: SM
authors.lastname: Zhang
authors.forename: Fu-hui
authors.initials: FH
authors.lastname: Dong
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008159:Lumbar Vertebrae / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D010243:Paralysis / Q000209:etiology*; D011183:Postoperative Complications / Q000209:etiology*; D012189:Retrospective Studies; D013123:Spinal Fusion / Q000009:adverse effects*; D013126:Spinal Nerve Roots / Q000293:injuries*